"It's been almost a decade since Brian [Acton] and I started WhatsApp, and it's been an amazing journey with some of the best people. But it is time for me to move on… I'm leaving at a time when people are using WhatsApp in more ways than I could have imagined. The team is stronger than ever and it'll continue to do amazing things… Thanks to everyone who has made this journey possible," Jan Koum said on Facebook.
On Monday, The Washington Post newspaper reported citing informed sources that Koum was planning to leave the company over disagreements with Facebook. The disagreements, in particular, included the messaging service's strategy, Facebook’s attempts to use its personal data and weaken its encryption.
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Facebook bought WhatsApp for more than $19 billion in 2014.